To find the volume of a rectangular prism, you can use the formula:
\[ \text{Volume} = \text{length} \times \text{width} \times \text{height} \]
In your case, if the dimensions are all 7 inches (assuming these are the length, width, and height), then:
\[ \text{Volume} = 7 \text{ inches} \times 7 \text{ inches} \times 7 \text{ inches} = 343 \text{ in}^3 \]
So, the volume of the rectangular prism is 343 in³.